Oh it attracts all the hipsters. Infact a little known fact is the brighton buildings are actually all shaped like a triangle and recently they have injected wolfs to the city because... well there super indie. The police also ban cloths that arent alternitive enough.
Its also full of the gays! And ofcourse unicorns and rainbows which inevitably come with homosexuality.
But seriously, its would be wrong to genralise the population of brighton. Yes there is probably a sligtly higher amount of gay and 'hipster' people but its still a pretty normal sea side city.